Is right click a Javascript event?

As others have mentioned, the right mouse button can be detected through the usual mouse events (mousedown, mouseup, click). However, if you're looking for a firing event when the right-click menu is brought up, you're looking in the wrong place. The right-click/context menu is also accessible via the keyboard (shift+F10 or context menu key on Windows and some Linux). In this situation, the event that you're looking for is oncontextmenu: